I had a 1995 F150 short bed PU. I built an 8 ft camper and put it on the PU. It sagged in the rear so I installed Firestone riderites air bags in the rear. It was light in the front but put 50,000 miles on that PU. Too much weight and too much load for the 1/2 ton. Replaced tranny but when it need another tranny traded it off. The PU was basically junk by the time I sold it.
Read the posts every day and you will see the problems. Saw a post couple of days ago RVer has new tranny in 2003 1/2 ton PU. Why? Transmissions should last the life of the vehicle unless it was overloaded or a bused like my 1/2 ton PU. Probably not the answer you were looking for but I would get a 3/4 ton PU and install TC.